title: [Diurnal changes in greenhouse gases at water-air interface of Xiangxi River in autumn and their influencing factors].
abstract: With the closed chamber and gas chromatography method, a 24-hour continuous monitoring was carried out to understand the greenhouse gases fluxes across the water-air interface of the Xiangxi River Bay, the Three-Gorges Reservoir in Autumn. Results indicated that the fluxes of CO2, CH4 and N2O across the water-air interface showed an obvious diurnal variation. The absorption and emission process of CH4 showed strong diurnal variation during the experimental period, reaching the highest emission at 1 am, whereas CO2 and N2O were emitted all day. The fluxes of CO2 ranged from 20.1-97.5 mg x (m2 x h)(-1) at day and 32.7-42.5 mg x (m2 x h)(-1) at night, the fluxes of N2O ranged from 18.4-133.7 microg x (m2 x h)(-1) at day and 42.1-102.6 microg x (m2 x h)(-1) at night. The fluxes of CO2 had positive correlation with wind speed and negative correlation with pH. The fluxes of N2O had positive correlation with pH.
authors.affiliation: Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. huangwm@ihb.ac.cn
authors.forename: Wen-Min
authors.initials: WM
authors.lastname: Huang
authors.forename: Kong-Xian
authors.initials: KX
authors.lastname: Zhu
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Bo-Shi
authors.initials: BS
authors.lastname: Yu
authors.forename: Xi-Gong
authors.initials: XG
authors.lastname: Yuan
authors.forename: Rui-Jie
authors.initials: RJ
authors.lastname: Feng
authors.forename: Yong-Hong
authors.initials: YH
authors.lastname: Bi
authors.forename: Zheng-Yu
authors.initials: ZY
authors.lastname: Hu
mesh_terms: D000388:Air / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring; D005740:Gases / Q000032:analysis; D017752:Greenhouse Effect; D000432:Methanol / Q000032:analysis*; D009569:Nitric Oxide / Q000032:analysis; D045483:Rivers / Q000737:chemistry; D012621:Seasons; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis
chemical_list: D000393:Air Pollutants; D005740:Gases; D014874:Water Pollutants, Chemical; D014867:Water; D002245:Carbon Dioxide; D009569:Nitric Oxide; D000432:Methanol